Version 2.1
16 March 2006
Page 13 of 33
Vega Gateway Scenarios.
©2005-2006 VegaStream Ltd.
Examples are given in best faith – ensure that you check the capabilities of systems before
deploying them, especially the functionality of devices not designed and delivered by VegaStream.
IP Network
•
Recommend – private IP network between sites
•
Can be any reliable IP connection, including leased line, line of site laser / wireless
connection and satellite
•
QOS should be implemented to ensure that VoIP packets pass through the network in a
consistent and timely manner and are not discarded by congested routers
•
Consider VPN between sites as this:
- removes any issues with firewalls / NAT
- encrypts audio and management data
•
For inter-site operation the Internet can be used, but contention and available bandwidth
must be considered
•
Recommend – a VPN should be used from the home user to the company LAN. This is
important for securing data access to the company site, and for VoIP it gets around NAT
traversal issues
User experience
•
Exactly the same operation as if their analog phone was physically connected directly to
the PBX
- pick the handset up and you dial tone from the PBX (this may be stuttered by the PBX to
indicate voice mail)
- hookflash / recall will allow the phone to access advanced features of the PBX (like call
transfer, follow me, camp-on-busy, conferencing)
•
There might be a slightly longer delay needed between clearing down from 1 call to getting
dial tone ready to make the next call.
USPs
•
Prolongs the life of existing legacy equipment
•
Allows users to be situated where ever most convenient, not limited by the location of the
PBX.
•
PBX features are available to users (through use of hook-flash and DTMF commands)
•
No user re-training
•
Simple self-contained solution
Considerations
•
Need to ensure that the PBX has analog phone connectivity – proprietary digital phones
cannot be extended in this manner
•
Emergency calls must be considered; it may be necessary to have a special “Emergency”
phone
Future extensions
•
Installation of Proxy / gatekeeper to provide IP-PBX functionality (FXS gateways and IP
phones can be re-used in this new configuration).
3
rd
party product choices
•
For NAT traversal between sites, consider SNOM NAT filter, SIParator or Alcatel T610
•
For VPN at home site consider Alcatel T610
VoIPon Solutions www.voipon.co.uk [email protected] Tel: +44 (0) 1245 600560
